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Net Loss per Common Share - Calculation of Net Loss and Number of Shares Used to Compute Basic and Diluted Earnings per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Earnings Per Share [Abstract]            
Net loss $ (4,275) $ (7,861) $ (5,959) $ (7,894) $ (12,136) $ (13,853)
Deemed dividend for triggering of warrant down round feature (55)       (55)  
Net loss attributable to common stockholders $ (4,330)   $ (5,959)   $ (12,191) $ (13,853)
Weighted average shares outstanding - basic [1],[2] 2,273,187   101,862   1,171,994 102,956
Weighted average shares outstanding - diluted [1],[2] 2,273,187   101,862   1,171,994 102,956
Net loss per share - basic [1],[2] $ (1.90)   $ (58.50)   $ (10.40) $ (134.55)
Net loss per share - diluted [1],[2] $ (1.90)   $ (58.50)   $ (10.40) $ (134.55)
[1] * reflects, one-for-seven hundred (1:700) reverse stock split effected on December 24, 2019.
[2] reflects, one-for-seven hundred (1:700) reverse stock split effected on December 24, 2019.